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Finding the Third Proportional to 685.75 and 919.38

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Solution

The third proportional to 685.75 and 919.38 is: 1,232.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.75 : 919.38 = 919.38 : x
  2. Step 2: Convert to fraction form
    685.75/919.38 = 919.38/x
  3. Step 3: Cross multiply
    685.75x = 919.38 × 919.38
  4. Step 4: Simplify right side
    685.75x = 845,250.39
  5. Step 5: Solve for x
    x = 845,250.39/685.75
  6. Step 6: Final answer
    x = 1,232.59

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.